Why did the man say 'have a good day' to the girl behind me and not me ?

I was at the supermarket express lane the other day and the cashier said 'have a good day' to the girl behind me and not me. Was it because she had tight jeans on ? Her hair was done up, she smelled nice too come to think of it. her long legs also had those thigh boots on with heels. Her greenish-blue eyes sparkled and her full supple lips had gloss on them... I believe she wore a Movado watch too....